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Ultrasonic pretreatment of soft wood biomass prior to conventional pyrolysis: scale-up effects and limitations

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Cherpozat, L. et Loranger, E. et Daneault, C. (2019). Ultrasonic pretreatment of soft wood biomass prior to conventional pyrolysis: scale-up effects and limitations. Biomass and Bioenergy, 124 . p. 54-63. ISSN 0961-9534 (ISSN) DOI 10.1016/j.biombioe.2019.03.009

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Résumé

After finding a successful ultrasonic wood treatment that enhanced bio-oil yield prior to pyrolysis in our laboratory, the next logical step was the scaling up of the process. Hence, this work aims to study the effects and limitations of an ultrasonic wood pretreatment scale-up from the laboratory scale (200 g) to the pilot scale (700 g). Wood chips were characterized by elemental chemical analysis, X-ray Photoelectrons Spectroscopy (XPS), Thermogravimetric Analysis (TGA), and Scanning Electron Microscopy (SEM). XPS and TGA did not show any change in the surface chemical composition. However, the SEM images clearly showed that the treatment in the bath allowed surface cleaning of the wood, thus creating an opening in the wood physical structure and allowing better heat transfer, as seen in the TGA analysis. As often found in such an endeavor, it was shown that these same ultrasonic conditions applied to a larger scale did not lead to the same results. The wood from the pilot scale unit (PSU) exhibited the same characteristics as the untreated wood. Thus, PSU did not allow an opening in the wood structure, as shown in the SEM images, which would have resulted in better heat transfer and thus in a higher bio-oil yield. From our experience with such systems, a hypothesis could be dependent on the greater efficiency of the PSU, especially at high frequencies, which could lead to the opposite effect than what was expected. Further investigations are necessary to overcome this limitation and to truly assess the phenomenon. © 2019 Elsevier Ltd

Type de document: Article
Mots-clés libres: chemical analysis heat transfer pyrolysis scanning electron microscopy surface cleaning wood products wooden buildings X ray photoelectron spectroscopy elemental chemical analysis high frequency HF physical structures scale-up effects surface chemical composition ultrasonic pretreatment wood treatment X-ray photoelectrons thermogravimetric analysis biofuel chemical composition laboratory method scale effect ultrasonics wood
Date de dépôt: 01 juill. 2021 14:46
Dernière modification: 01 juill. 2021 14:46
Version du document déposé: Post-print (version corrigée et acceptée)
URI: http://depot-e.uqtr.ca/id/eprint/9629

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